1. Wu, X., Comparison logic and its application in digital circuits, inProc. of ICCAS, Beijing, (ed. Institute of Electronics, Chinese Academy of Sciences), Beijing: Science Press, and Singapore: World Scientific, 1985, 440–443.
2. Wu, X.,Design Principle of Multivalued Logic Circuits (in Chinese), Hangzhou: Hangzhou University Press, 1994.
3. Wu, X., Chen, X., Algebra system for ECL logic circuits,IEE Proceedings (Part G), 1991, 138 (6): 679.
4. Elmasry, M. I.,Digital Bipolar Integrated Circuits, New York: John Wiley & Sons, 1982.
5. Skokan, Z. E., Emitter function logic—Logic family for LSI,IEEE J. Solid-State Circuits, 1973, 8 (5): 356.